Effects of fluctuating magnetic fields on a superconducting bulk rotor shielded with superconducting rings

11th European Conference on Applied Superconductivity

Yamagishi, K.^1 ; Ogawa, J.^2 ; Tsukamoto, O.^3

Faculty of Engineering, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama

240-8501, Japan^1

Department of Electrical and Electronic Engineering, Niigata University, 8050, Ninomachi, Ikarashi, Niigata

950-2181, Japan^2

Faculty of Science and Technology, Sophia University, 7-1, Kioicho, Tokyo, Chiyoda-ku

102-8554, Japan^3

关键词: Bulk superconductors;    Exposed to;    Rotating machine;    Superconducting bulks;    Superconducting rings;    Superconducting rotors;    Test equipments;    Trapped magnetic field;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/507/3/032060/pdf
DOI  :  10.1088/1742-6596/507/3/032060

来源: IOP

【 摘 要 】

We study the effect of a fluctuating magnetic field, which is one of the technical problems for trapped magnetic fields in a bulk superconductor, to realize a practical bulk superconductor rotating machine. Previous research and other's research has shown that fluctuating magnetic fields reduce the strength of trapped magnetic fields in superconducting bulk modules [1, 2]. This deters development of applications of AC rotating machines because superconducting bulk modules are always exposed to a fluctuating magnetic field. Therefore, it is necessary to develop a method to control decrease of the trapped magnetic field. We propose a method to use the shielding ring of a superconducting wire to achieve this goal and the effects are confirmed experimentally [3]. We are now building test equipment for examining the performance of a shielding ring in a bulk rotating machine. This paper reports the test result for the shielding ring applied to the bulk superconducting rotor that is a part of the test equipment.